source.c

使用Eclipse开发的词法分析器和语法分析器

atoi(s) char *s {   
  int sign, n;
  while(isspace(*s)) ++s;
  sign = 1;
  switch(*s) {
    case '-': sign = -1;
    case '+': ++s;
    }
  n = 0;
  while(isdigit(*s)) n = 10 * n + *s++ - '0';
  return (sign * n);
  }




a(s)
{
int i=0;
i++;
}